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That is not a Sonos speaker as they don't do ceiling speakers. It could be connected to a Sonos:Connect or Connect:AMP but we cannot tell from a photo of the speaker. You need to find what device is on the other end of the wire to that speaker.

Author of the leading 3rd party Sonos apps for Windows and the first fully-featured Alexa Skill for Sonos

Typically, the other end is going to be in a closet or some other out of the way place. For each of the ceiling speakers you have, you'd see a single wire that is then split in to 2 separate wires (positive and negative). Assuming you just bought the home, the previous owner most likely took the amp with them, but you see these wires connected to an amp.